Although various new products and installation methods
constantly are being introduced to the roofing industry, one
important theme has been consistent during the years—how
products and components are assembled and installed are key to
their performances. Edge-metal systems are particularly important
to roof system performance, and it is crucial you know how to
properly install edge metal at two of the most common locations in
low-slope roofing: parapets and perimeter edges.
Roofing professionals know small components of a roof system can
cause big problems during the system's life cycle if not properly
addressed during design and installation. Although edge-metal
systems are small parts of roof systems in overall proportion, they
are a roof system's first line of defense against wind. If a roof
edge comes off, the integrity and watertightness of the roofing and
insulation materials may be compromised.
The Roofing Industry Committee on Weather Issues (RICOWI) noted
in its September 2007 report about Hurricane Katrina that nearly 95
percent of roof system failures resulting from the storm were
caused by poor workmanship or substituted materials. (Editor's
note: NRCA does not necessarily
agree with RICOWI's findings. For more information about NRCA's findings, see "Hurricane
Katrina: observations from the field," December 2005...
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